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EZR32WG-490MHZ Scheda tecnica(PDF) 7 Page - Silicon Laboratories |
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EZR32WG-490MHZ Scheda tecnica(HTML) 7 Page - Silicon Laboratories |
7 / 29 page 4. Power Supply and Reset 4.1 MCU Power Selection The EZR32 Wonder Gecko MCU on the WSTK6223 is designed to be powered by three different sources: • Through the on-board debugger. • Through the EZR32's own USB regulator. • By a 3V Battery. Selecting the power source is done with the slide switch in the lower left corner of the board. Figure Figure 4.1 WSTK6223 Power Switch on page 4 shows how the different power sources can be selected with the slide switch. 3.3V VMCU AEM USB BAT USB Mini-B Connector Advanced Energy Monitor 5V 3V Lithium Battery (CR2032) Wireless MCU USB Micro-B Connector USB_VREGI (5V) USB_VREGO (3.3V) . LDO Figure 4.1. WSTK6223 Power Switch With the switch in the DBG position, an on-board low noise LDO with a fixed output voltage of 3.3V is used to power the MCU. This LDO is again powered from the "J-Link" USB cable. The Advanced Energy Monitor is now also connected in series, allowing accurate high speed current measurements and energy debugging/profiling. With the switch in the USB position, the integrated linear regulator in the EZR32 Wonder Gecko MCU is used to power the rest of the chip as well as the USB PHY. This allows a USB device application where the MCU acts as a bus powered device. Finally, with the switch in the BAT position, a 20mm coin cell battery in the CR2032 socket can be used to power the device. Note: The Advanced Energy Monitor can only measure the current consumption of the EZR32 when the power selection switch is in the DBG position. 4.2 Board Controller Power The Board Controller is responsible for important features such as the debugger and the Advanced Energy Monitor, and is powered exclusively through the USB port in the top left corner of the board. This part of the kit resides on a separate power domain, so a differ- ent power source can be selected for the MCU while retaining debugging functionality. This power domain is also isolated to prevent current leakage from the MCU power domain when power to the Board Controller is removed. 4.3 Backup Power Domain The kit contains a backup capacitor that can be used together with the EZR32 Wonder Gecko's backup power domain. In this case, all other power sources are removed from the kit, and only a small part of the EZR32 runs off the capacitor. It is also possible to enter backup mode while the Board Controller is powered by selecting either BAT or USB with no battery in the socket or USB cable in the connector. EZR32WG 490MHz Wireless Starter Kit Power Supply and Reset silabs.com | Smart. Connected. Energy-friendly. Rev. 1.2 | 4 |
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